What should I do about an arachnoid cyst?

I went to the emergency room because I had a "migrane (migraine)" for 4 days. At the ER they did a CT and found what I was told is an arachnoid cyst. The doctor told me it is very common and nothing to worry about, but after doing research online I have found that it is not that common and can't be diagnosed with just a CT. She told me this cyst was present in more than fifty percent of the population and not causing my headaches, just making them more intense. She referred me to an internal medicine specialist. Should I go ahead and contact this doctor or do I need to go to a Neurologist? Everything I have read says I need a Neurosurgeon, I do not have insurance and can't afford more bills than needed. Should I skip her advice and go directly to a Neurologist?

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